Fig. 3

Phylogenetic analysis. Maximum Likelihood Tree based on the complete SARS-CoV-2 genome. The analysis was carried out as reported [7] and is detailed in Supplementary Methods. The evolutionary history was inferred by the Neighbor-Joining method. The optimal tree is shown. The percentage of trees in which the associated taxa clustered together is shown next to branches. The tree is drawn to scale, with branch lengths proportional to the number of substitutions per site. This analysis involved 34 nucleotide sequences. There were a total of 32,122 positions in the final dataset. Evolutionary analyses were conducted in MEGA11 [26]. The name of each sequence is composed of four elements separated by vertical lines: the host where the virus was isolated; the virus strain name (for the SARS-CoV-2 sequences isolated from animals other than humans, countries where they were found are shown in brackets); the specific SARS-CoV-2 variant that they belonged to; and the GenBank or GISAID Accession ID. Bold names indicate sequences belonging to the B.1.177 variant. The black dot (●) marks the present dog SARS-CoV-2 sequence